Toshiba RBC-EXW21E2 Quick Reference page 34

Part Name
A: ON/OFF button
B: All ON button
C: All OFF button
ON/OFF button
A :
Press this to start up or stop an individual air conditioner.
Press this to start up all the air conditioners at the same time.
The indoor units which can be operated by the ON-OFF controller
NOTE
now start operating in sequence at intervals of 1 to 2 seconds.
Press this to stop all the air conditioners at the same time.
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ALL OFF button
C :
B : ALL ON button